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The aim of this work was estimate genetic parameters in progeny tests of Eucalyptus grandis, in order to evaluate the potential of direct and indirect selection for growth, resistance to rust and for characteristics that reflect better sawn wood quality. The progeny test was planted in two different sites in São Paulo state, Brazil, using a randomized block design, with 30 replicates, 176 progenies and one plant per plot, with a spacing of 3 x 2 meters. Diameter at breast height (DBH), height (H), degree of infection by rust (DIR), bifurcation (BIF), tortuosity (TOR), number of branches (NB) and branch diameter (BD) were evaluated. The progeny mean heritability indicated median genetic control (> 0.50) for DHB and H in both sites and the genetic correlation between these variables was of great magnitude (> 0.75). The DIR and NB had high progeny mean heritability values (> 0.50), and for BIF and TOR these values ranged from high to moderate (> 0.15) between sites. Genetic correlations between the main variables ranged from weak to moderate (< 0.70). The variables DHB, DIR and BIF revealed a genotype correlation between sites greater than 0.67, suggesting the formation of an improvement zone, seeking strategies based on simultaneous selection methods that prioritize variables with higher heritability.

Parâmetros genéticos em teste de progênies de polinização aberta de Eucalyptus grandis Hill ex Maiden